| Alvin to Orbetello | 5,628.59 mi (9,058.34 km) |
| Alvin to Oria | 5,978.41 mi (9,621.33 km) |
| Alvin to Oristano | 5,604.70 mi (9,019.90 km) |
| Alvin to Orta Nova | 5,863.47 mi (9,436.34 km) |
| Alvin to Orte | 5,678.15 mi (9,138.10 km) |
| Alvin to Ortona | 5,767.85 mi (9,282.46 km) |
| Alvin to Orvieto | 5,656.68 mi (9,103.55 km) |
| Alvin to Orzinuovi | 5,466.83 mi (8,798.02 km) |
| Alvin to Osimo | 5,685.61 mi (9,150.11 km) |
| Alvin to Ospitaletto | 5,467.09 mi (8,798.43 km) |
| Alvin to Ostuni | 5,966.72 mi (9,602.52 km) |
| Alvin to Ottaviano | 5,829.76 mi (9,382.08 km) |
| Alvin to Ovada | 5,439.72 mi (8,754.38 km) |
| Alvin to Ozieri | 5,598.98 mi (9,010.68 km) |
| Alvin to Paceco | 5,855.44 mi (9,423.42 km) |
